{"id":"6968d2f0-5473-4973-84f1-921c00235816","shortId":"G3CZtX","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/89` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions required.\n\nThe broader platform advertises four categories of endpoints: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing model.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The specific functionality behind `/api/v1/trades/89` is unclear beyond its generic \"Premium API Access\" label; it may relate to a specific trade record or trading-related data, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["micropayment API","pay-per-call API","x402 endpoint","USDC API","Base network API","trades API","low fee API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema specification found","The specific purpose and expected input/output of /api/v1/trades/89 is undocumented","No request or response examples available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/89","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/trades/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of /api/v1/trades/89 specifically is unclear. Pricing is clear ($0.02/request in USDC on Base), but the lack of any functional documentation makes this a near-stub 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'/api/v1/trades/89':67,213 '/docs':175 '/pricing':177 '/readme':179 '/request':17,34,167 '0.02':16,33,95,166 '000':87 '0x8335':92 '20':86 '6':100 'Base network API' 'USDC API' 'accept':75 'access':45,73,221 'advertis':81,122 'ai':10,27,134 'analysi':138 'analyt':128 'api':4,21,41,72,112,220 'avail':205,242 'base':7,24,61,88 'base-network' 'behind':51,212 'beyond':216 'broader':120 'cannot':238 'categori':124 'challeng':80 'classif':141 'confirm':240 'connect':185 'content':191 'convers':158 'cost':84 'crawl':208 'data':9,26,127,131,235 'decim':101 'document':170,200 'embed':142 'endpoint':14,31,50,65,126,162 'equal':94 'estim':152 'exact':108 'exampl':204 'exchang':147 'export':132 'extrem':172 'feed':146 'financ':11,28,143 'four':123 'function':211 'gas':151 'gate':3,20,44 'generat':159 'generic':218 'geocod':156 'infrastructur':154 'insight':133 'json-response' 'key':113 'label':222 'learn':136 'limit':115 'list':69,161 'low fee API' 'lowpaymentfee.com':35 'machin':135 'made':104 'marketplac':42 'materi':243 'maximum':83 'may':224 'metric':129 'micropay':55 'micropayment API' 'model':169 'network':62 'no-api-key' 'offer':8,25 'openapi':195 'page':180 'pay-per-call API' 'payment':102 'per':53,96 'per-request':52 'per-request-billing' 'platform':5,22,121 'post':76 'post-endpoint' 'premium':71,219 'price':145,168 'prompt':187 'protocol':40 'quot':150 'rate':114,148 'record':230 'relat':225,234 'render':182 'report':130 'request':54,77,97 'request/response':198 'requir':118 'schema':199 'scheme':109 'sentiment':137 'settl':56 'share':163 'spars':173 'spec':196 'specif':64,210,228 'subscript':117 'summar':140 'text':139 'token':149 'trade':229,233 'trades API' 'trading-rel':232 'unclear':215 'unit':89 'usag':203 'usdc':58,91,98 'usdc-micropayment' 'use':99 'util':13,30,155 'valid':157 'varieti':48 'via':105 'wallet':186 'web3':144 'x402':2,19,39,79,107 'x402 endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"91860ded-b61b-4fb7-b19e-c40df8b0fee5","listingId":"6968d2f0-5473-4973-84f1-921c00235816","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/trades/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:08.843Z"}],"sources":[{"listingId":"6968d2f0-5473-4973-84f1-921c00235816","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:08.843Z","lastSeenAt":"2026-04-26T01:02:58.404Z"}],"details":{"listingId":"6968d2f0-5473-4973-84f1-921c00235816","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/89 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/89"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade-related data via a single paid API call without needing an account or API key","Integrating pay-per-request data access into autonomous agent workflows on Base","Programmatic access to premium content gated behind x402 micropayments"],"bestFor":["Agents or developers wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and clients on the Base network","Low-volume or sporadic API consumers who prefer per-call pricing over subscriptions"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited subscription plans","Developers not set up for USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.888Z"},"updatedAt":"2026-04-26T01:02:58.404Z"}}